When you define a jcrReferenceResolver in a delivery endpoint and the id cannot be resolved, (maybe because it was deleted) the JSON contains the id as a string instead of the Object. (See screenshot)

This is not useful and you have to do a lot of error checking in the consuming client (SPA).

Better would be to remove the item completely or even better to add a property where you can configure how the jcrReferenceResolver should handle unresolvable items.

This would make the life easier for the FE devs and increase their appreciation for Magnolia a lot.